Technical information

Vitorond 200, VD2A Series Service
5354 789 - 01
12
Check Proper Operation of Safety Header
Inspection and Maintenance
Check pressure gage, air vent and pressure relief valve.
Ensure pressure relief valve does not leak. Also ensure
pressure relief valve operates in accordance with
information provided by the manufacturer.
Ensure proper system water pressure in diaphragm
expansion tanks, low water cut-offs, pumps, and pressure
relief valve.
Note: Observe the instructions by the expansion tank
manufacturer. Perform all tests on a cold system.
Flush float water type low water cut-offs (if used).
The usual water fill pressure is between 12 and 15 psig
with the system cold. A lower pressure gage reading
usually indicates loss of water due to leakage. All leaks
must be corrected.
Note: Refer to instructions packaged with automatic
fill valve. Follow local regulations with respect to
backflow preventers.
If oil-lubricated pumps are used, ensure proper lubrication.
If motorized zone valves are used, refer to maintenance
instructions provided with zone valves.
If an older non-diaphragm expansion tank is used, ensure
the correct water level is present (approx. h full).
1. Drain system or close cap valve on the diaphragm
expansion tank and reduce the pressure until the
pressure gage indicates “0”.
2. If the inlet pressure of the diaphragm expansion tank
is lower than the static system pressure, top up with
enough nitrogen to raise the inlet pressure higher than
the static system pressure 0.1 to 0.2 bar (1.5 to 3 psig).
The static pressure corresponds to the static height.
3. Top up with water until the filling pressure of a cool
system is higher than the inlet pressure of the
diaphragm expansion tank 0.1 to 0.2 bar (1.5 to 3 psig).
Max. operating pressure is 5 bar (75 psig).
Check Proper Operation of Expansion Tank, Low Water Cut-offs and Pumps
Check Proper Expansion Tank and System Pressures